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Finding the Fourth Proportional to 6,660, 9,990.81 and 2,762.28

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Solution

The fourth proportional to 6,660, 9,990.81 and 2,762.28 is: 4,143.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,660 : 9,990.81 = 2,762.28 : x
  2. Step 2: Convert to fraction form
    6,660/9,990.81 = 2,762.28/x
  3. Step 3: Cross multiply
    6,660x = 9,990.81 × 2,762.28
  4. Step 4: Simplify right side
    6,660x = 27,597,414.65
  5. Step 5: Solve for x
    x = 27,597,414.65/6,660
  6. Step 6: Final answer
    x = 4,143.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.